After Login to your panel, click on file manager for uploading website data files

Find Public_html folder of your domain

Check UPLOAD FILES button in bottom left and click on it

Now upload your files here in zip format

Now Extract your uploaded zip file

How to upload SQL database files

Click on MYSQL MANAGEMENT in your direct admin panel dashboard

Click on create new database

Now create database with using username & password

Now Click on Login to phpMyAdmin

Now upload your SQL file here

Note : After uploading the website files and SQL file customer have to connect the database to your files with the help of your web developer